Improvement in heating-furnaces



1. s; Pamesa E. DA/ l-s. [Heating Furnaces.

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AM PHOTO-LITHOGRAPH/c Ca Mxfosaanlvs FnacESQ) UNITED STATES JOHN'G.PORTER, or NEW YORK, N. Y., AND ELIJAH DAvIs, OE .IERsEY CITY,

PATENT QEFIGE.

NEW JERSEY.

IMPROVEMENT IN HEATING-FURNCES.

Specification forming part of Letters Patent No. 139,812, dated June10,1873; application filed March 24, 18,73.

To all whom it lmay concern:

Be it known that we, J oHN G. PORTER, of the city, county, and State ofNew York, and ELIJAH DAVIS, of Jersey City, in the county of Hudson andState of New Jersey, have invented an Improvement in Furnaces forfarming Dwellings and other buildings, of which the following is aspecification:

In this invention, the furnace, which may be mainly or whollyconstructed of soap-stone withoutloss by radiation, is of a box orparallelogrammic shape, and composed of a laterally-arrangedor juttinglire-box, surrounded by an air-jacket or space in communication with anumber of cold-air circulating pas- -sa-ges of a fiat or spreadconstruction, one

above the other, and giving a zigzag or tor-V tuous course to the air ina succession of sheet-s at right angles to the passage of the heatedgases or products of combustion, which are received from the lire-boxthrough upper and lower openings of different relative area,

and made to circulate through upper and lower sets of zigzag or reverseilues exposed to the air-passages which run at right angles to them, andto which the air to be heated is admitted from below through holes ofsuitable and preferably dillerent area on the one side of the furnace,substantially as hereinafter described. A furnace constructed inaccordance with this invention combines great simplicity withefficiency, besides being most economical as regards its consumption offuel, and, as the whole air-heating surfaces may be composed ofsoap-stone, being withal a most healthy heater.

` In the accompanying drawing which forms part of this specification,Figure 1 represents project-ion from the body of `the furnace,

which is of a square or parallelogrammic shape. Said fire-box, with itsash-pit, is'iucased by an air-heating jacket or space, C, incommunication at its sides and above with the airheating spaces ofthebody of the furnace. The heated gases or products of combustion passfrom the lire-box A, through lower and upper openings c d, into, and aremade to circulate through, lower and upper horizontal `sets D D of zi'za ser entine or reverse dues ef, of similar construction, each set,and terminating respectively in outlets Vg (one of which only here isshown) at the back of the furnace, in communication with the chimney.The lower opening c, through which a portion of the gaseous products ofcombustion passes from the fire-box to the set D of flues, may consistof a perforated plate or otherwise, and is of less area than the upperopening d that communicates with the set D' of lines, in order that thepassage of the heated gases may be equally divided between the two setsD D of iiues or air-heating surfaces, instead of being unduly drawnAaway through the lower set.

The air to be heated is received through lower openings h along the oneoriire-snle of the furnace, preferably of diminishing area as theyapproximate the center of the furnace, Where the heat is greatest, so ast0 equalize the distribution ot' the air over the heating-surfaces. Fromthese" openings It the cold air passes around the lire-chamber andwithin the iirst or lowest passage oi' a number of zigzag or reversehorizontal passages., i, of a at or spread construction, arranged oneabove the other, and exposing-the air, as it circulates therethrough ina thin or sheet form at right angles to the course or courses of the'heated gases, to the whole heating-surfaces of the lower and upper setsD D of ilues, the air thusheated 'ultimately passing oli' by any numberof openings, ls, in

the top of the furnace. The course of the` What is here claimed, anddesired to be seh, for operation in relation with each other,

cured by Letters Patent, isessentially as herein set forth. Y

The arrangement, substantially as herein described, of the re-chamber A,the opeu- JOHN Gr. PORTER.

ings c d of different relative area, as speci- ELIJAH DAVIS.

ed, the upper and lower sets D D of reverse Witnesses:

or return tlues e f, and the c0ldair: eircnlat- FRED HAYNES,

ing horizontal passages z' with their inlets v MICHAEL RYAN.

